Stuck on Level1 :-(

[max007]

Hi i entered a small room and the grey screen go up, there is a man who tries to block a water to not come in, when it ends i beat a "monster", i dont know what to do becoz, the door which i came in to the room are locked and the other door are blocked by a wood, and i can´t destroy it... there is a small door too, but it can´t be open.. pls help